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AM26LV32: comparator threshold calculation

Part Number: AM26LV32

Hi Team,

we are using the AM26LV32 a a comparator and have difficulties calculating the threshold voltages.

The circuit is the following:

The upper comparator has a positive switching threshold (at the +input) and is normally 1 when Uin is 0 V. This switching threshold has been correctly calculated and measured.

The lower comparator has a negative switching threshold (at the + input) and is normally 0 at a Uin of 0 V. This switching threshold was measured at -2.04 V but I am not able to calculate this threshold value.

If I take the feedback resistor of 82 kohm in parallel with R68 2.7 kohm (since the output is at 0 V), I don't get the measured threshold.

Am I missing something in the circuit or with the AM26LV32?
Thanks for your support.

Regards,
Alen
  • The thresholds are set by the voltage dividers. (The feedback resistors add a little bit of hysteresis.)

    Anyway, the AM26LV32 does not allow the input voltage to go below −0.3 V (see the recommended operating conditions). The AM26LV32E has a wider common-mode input voltage range.